Enable import of XDATA series from CSV files (#3179)

* Enable import of XDATA series from CSV files
Since XDATA series are preserved across merges this allows to add
arbitrary XDATA series to any activity.
Sample WEATHER file is included for testing.
Sample swim file is also included, once imported set Sport=Swim and use
Fix Lap Swim with pool length=25 to rebuild standard series and laps
Fixes #2010 item 4.

* FixLapSwim - Alternative way to store pauses in XData
Some devices s.t. Moov Now generates a CSV with REST field
after each length. FixLapSwim now can use this alternative
way to express pauses and to mark end of laps.
This is intended to be used together with XDATA csv import.
A Moov Now csv file modified to comply with our format is
added as an example to test folder.

test/rides/2019_10_10_09_56_00.csv

@@ -0,0 +1,12 @@
+XDATA: WEATHER,,,,,
+SECS,KM,WINDSPEED:kmh,WINDHEADING,TEMPERATURE:celsius,HUMIDITY:%
+1,0.00405,7.9992,90,5,93
+901,6.78945,7.9992,70,5,91
+1801,9.83493,7.9992,70,5,91
+2701,17.0663,7.9992,70,5,91
+3601,22.8818,7.9992,70,5,91
+4501,27.7603,7.9992,70,5,91
+5401,34.0975,7.9992,70,5,91
+6301,42.4375,7.9992,70,5,91
+7201,51.6657,10.0008,220,12,57
+8093,59.3946,5.0004,0,7,93

test/swims/2019_09_23_06_33_00.csv

@@ -0,0 +1,48 @@
+XDATA: SWIM
+SECS,KM,TYPE,DURATION,TURN_TIME,SWIM_TIME,STROKES,REST
+1 , 0, 1,39.78,8.78,31.00,16,0.00 
+2 , 0, 1,44.02,7.13,36.89,17,0.00 
+3 , 0, 1,41.54,8.37,33.17,15,0.00 
+4 , 0, 1,40.92,10.54,30.38,13,0.00 
+5 , 0, 3,49.29,10.23,39.06,13,0.00 
+6 , 0, 2,57.04,4.03,53.01,29,0.00 
+7 , 0, 2,54.87,0.00,41.54,22,0.00 
+8 , 0, 2,54.25,12.40,41.85,23,28.52
+9 , 0, 1,22.32,0.00,22.32,11,43.40
+10 , 0, 1,34.41,0.00,34.41,15,19.84
+11 , 0, 1,30.38,0.00,30.38,13,31.62
+12 , 0, 1,31.31,0.00,31.31,13,31.93
+13 , 0, 1,32.86,0.00,32.86,14,33.17
+14 , 0, 1,31.00,0.00,31.00,13,19.84
+15 , 0, 2,41.54,0.00,41.54,23,22.94
+16 , 0, 2,44.95,0.00,44.95,25,21.08
+17 , 0, 2,55.65,10.70,44.95,24,0.00 
+18 , 0, 1,50.53,11.78,38.75,16,0.00 
+19 , 0, 1,60.76,0.00,46.19,16,30.69
+20 , 0, 1,42.78,0.00,42.78,15,27.59
+21 , 0, 1,34.41,0.00,34.41,13,24.49
+22 , 0, 1,33.79,0.00,33.79,13,29.45
+23 , 0, 1,33.48,0.00,33.48,13,21.08
+24 , 0, 1,33.79,0.00,33.79,13,20.15
+25 , 0, 2,56.42,9.92,46.50,24,0.00 
+26 , 0, 2,57.04,9.92,47.12,23,19.53
+27 , 0, 1,34.72,0.00,34.72,14,19.53
+28 , 0, 1,39.68,0.00,39.68,15,44.95
+29 , 0, 1,39.99,0.00,39.99,16,17.98
+30 , 0, 1,37.51,0.00,37.51,14,24.18
+31 , 0, 1,36.58,0.00,36.58,14,25.73
+32 , 0, 1,35.03,0.00,35.03,13,34.41
+33 , 0, 1,32.55,0.00,32.55,14,16.74
+34 , 0, 2,46.50,0.00,46.50,25,0.00 
+35 , 0, 2,61.07,0.00,45.57,24,19.84
+36 , 0, 1,32.55,0.00,32.55,13,33.79
+37 , 0, 1,35.34,0.00,35.34,14,21.70
+38 , 0, 1,31.62,0.00,31.62,11,27.59
+39 , 0, 1,47.12,10.85,36.27,13,0.00 
+40 , 0, 1,49.29,10.85,38.44,14,32.55
+41 , 0, 1,32.24,0.00,32.24,13,18.60
+42 , 0, 1,45.26,10.54,34.72,14,0.00 
+43 , 0, 3,51.77,0.00,38.13,16,0.00 
+44 , 0, 2,57.35,10.54,46.81,25,16.74
+45 , 0, 1,36.27,0.00,36.27,14,25.11
+46 , 0, 1,31.93,0.00,31.93,12,0.00

test/swims/2019_09_23_18_30_00.csv

@@ -0,0 +1,104 @@
+XDATA: SWIM
+SECS,KM,TYPE,DURATION:secs,STROKES
+0,0,1,26.5,11
+26,0.025,1,26.562,11
+53,0.05,1,26.125,11
+79,0.075,1,26.625,12
+105,0.1,1,25.5,10
+131,0.125,1,26.875,12
+158,0.15,1,25.125,11
+183,0.175,1,23.84,11
+207,0.2,0,37.003,0
+246,0.2,1,24.062,10
+270,0.225,1,26.5,11
+296,0.25,1,25.625,12
+322,0.275,1,24.187,11
+346,0.3,1,24,11
+370,0.325,1,26.812,12
+397,0.35,1,25,10
+422,0.375,1,21.756,11
+444,0.4,0,37.678,0
+481,0.4,1,24.437,10
+506,0.425,1,23.5,11
+529,0.45,1,24.812,11
+554,0.475,1,25.5,12
+580,0.5,1,24.375,11
+604,0.525,1,25.25,13
+629,0.55,1,24,10
+653,0.575,1,21.433,11
+675,0.6,0,32.484,0
+707,0.6,1,24.812,10
+732,0.625,1,23.812,12
+756,0.65,1,24.625,11
+780,0.675,1,25,11
+805,0.7,1,24.437,11
+830,0.725,1,25.875,12
+856,0.75,1,25.562,14
+881,0.775,1,22.578,10
+904,0.8,0,27.316,0
+931,0.8,1,24.437,10
+956,0.825,1,24.437,12
+980,0.85,1,23.5,12
+1003,0.875,1,27.5,13
+1031,0.9,1,23.187,11
+1054,0.925,1,24.875,12
+1079,0.95,1,24.5,12
+1104,0.975,1,21.435,11
+1125,1,0,564.684,0
+1690,1,1,25.687,10
+1715,1.025,1,22.375,11
+1738,1.05,1,25,13
+1763,1.075,1,24.25,12
+1787,1.1,1,21.427,12
+1808,1.125,0,33.911,0
+1842,1.125,1,25.187,11
+1867,1.15,1,24.25,11
+1892,1.175,1,25.375,11
+1917,1.2,1,25,12
+1942,1.225,1,19.08,11
+1961,1.25,0,30.837,0
+1992,1.25,1,25.062,11
+2017,1.275,1,25.375,13
+2042,1.3,1,23.75,13
+2066,1.325,1,25.437,11
+2092,1.35,1,20.867,12
+2113,1.375,0,31.266,0
+2144,1.375,1,24,12
+2168,1.4,1,25.312,12
+2193,1.425,1,23.687,12
+2217,1.45,1,24,12
+2241,1.475,1,21.06,12
+2262,1.5,0,31.053,0
+2293,1.5,1,24.312,11
+2317,1.525,1,25,13
+2342,1.55,1,22.75,13
+2365,1.575,1,24.75,13
+2390,1.6,1,22.443,12
+2412,1.625,0,29.42,0
+2442,1.625,1,24,11
+2466,1.65,1,23.812,13
+2489,1.675,1,25.75,13
+2515,1.7,1,25.375,13
+2540,1.725,1,21.358,12
+2562,1.75,0,27.151,0
+2589,1.75,1,25.625,11
+2615,1.775,1,23.312,12
+2638,1.8,1,24.312,13
+2662,1.825,1,25.375,13
+2688,1.85,1,21.275,12
+2709,1.875,0,29.959,0
+2739,1.875,1,24.187,12
+2763,1.9,1,25.062,12
+2788,1.925,1,24.562,12
+2813,1.95,1,25.125,13
+2838,1.975,1,22.26,12
+2860,2,0,66.925,0
+2927,2,1,30.312,12
+2957,2.025,1,31.812,14
+2989,2.05,1,29.625,12
+3019,2.075,1,30.687,14
+3049,2.1,1,29.375,14
+3079,2.125,1,31.125,14
+3110,2.15,1,27.187,12
+3137,2.175,1,26.583,12
+3164,2.2,0,40.065,0