Springie: fix cant use float for option (fix #50)

Bug:
in Springiee battleroom when user wrote: "!setoptions ctf_inc_mult=0.1" it will reply "Value 0.1 is not valid for this option". This is because the server is located in Czech and expect  "!setoptions ctf_inc_mult=0,1". The fix is to set the "double.TryParse()" to use InvariantCulture.

Other tweak:
fix Springie can't be compiled in 32-bit Windows. The post-build path is too specific: "C:/Program Files (x86)", which only valid for 64-bit windows. Used %ProgramFiles% instead.