changes in download design to use only one version number where the 3 first are the app number and the last one is the data version, relative to the app version.
fixing copy paste error in update code.
fixing joining / splitting version to allow optional "v" at the beginning.
fixes for downloading assets and forcing reload of already loaded assets.
implementing to_string for android. ndk doesnt have it yet.
making splitVersion() more robust. now assuming empty version string is 0.0...
adding logs and fixing build on android.
Merge branch 'game/dragonfall_fixing_version_DLupdate' into game/dragonfall