Some writing/reading fixes, module declaration

• "Apply" button doesn't automatically close settings
• Increases the name length to 1024 characters (#6)
• Fixes some reading/writing issues (#7)
• Filenames display correctly in log
• Adds ModSettingsModule declaration for conditional compilation (#6)

Mods can now declare their own functions to make calling ModSettings.RegisterListenerToClass easier (replace LTBF_ with your own name):

@if(ModuleExists("ModSettingsModule")) 
public func LTBF_RegisterListener(listener: ref<IScriptable>) {
  ModSettings.RegisterListenerToClass(listener);
}

@if(!ModuleExists("ModSettingsModule")) 
public func LTBF_RegisterListener(listener: ref<IScriptable>) { }

@if(ModuleExists("ModSettingsModule")) 
public func LTBF_UnregisterListener(listener: ref<IScriptable>) {
  ModSettings.UnregisterListenerToClass(listener);
}

@if(!ModuleExists("ModSettingsModule")) 
public func LTBF_UnregisterListener(listener: ref<IScriptable>) { }