Merge pull request #1 from BigBrotherBot/release-1.10

Last update
change deprecated "version" argument in ArgumentParser
minor style change
checks the passed argument/file exists
Merge pull request #90 from ozon/improvements/argparse

[CORE] Improvements to command line arguments parsing
Merge pull request #2 from BigBrotherBot/release-1.10

Last update
change getNextMap to use CVARs only (no more mapcycle file parsing)
Merge pull request #91 from FenixXx/release-1.10

[URT] change getNextMap (iourt41) to use CVARs only (no more mapcycle file parsing)
xlrstats v3.0.0b2 - purging history tables, compatibility, start BattleLog frame
[CORE] add getTables() method to storage module
[XLRSTATS] call B3 storage getTables() method to support both MySQL and Sqlite
[TESTS] update tests to follow up recent changes to XLRstats