Don't process --game_data if its value is empty

Closes #418
Merge pull request #437 from dorkster/bugfixes

Don't process --game_data if its value is empty
Ignore speed effects when adding hero power cooldowns
Merge pull request #439 from dorkster/bugfixes

Ignore speed effects when adding hero power cooldowns
Added cooldown_hit to statblock, prevents players & enemies from being stunlocked due to fast/consecutive hits pushing them into the on hit animation.
Moved enemy sfx_hit out of block testing against hit cooldown
Corrected initial loaded values for cooldown_hit so that the ticks started at appropriately at zero
Configurable restyled NPC dialogs
Merge pull request #442 from josephbleau/hit_cooldown

Added cooldown_hit to statblock, prevents players & enemies from being stunlocked due to fast/consecutive hits pushing them into the on hit animation.
Merge pull request #444 from dorkster/npc_dialog

Configurable restyled NPC dialogs
Merge branch 'master' of https://github.com/clintbellanger/flare-engine