luainstance: Remove unnecessary hide()/kill() calls from xxxDelete functions

- functions:
    CWindowDelete()
    SignalBoxDelete()
    ComponentsTextDelete()
    CPictureDelete()
luainstance/cwindow: Add funktion setWindowColor
luainstance: Fix default parameter for config file getXXX functions

- Revert commit 'Fix default parameter for config file setXXX functions'
Merge remote-tracking branch 'cool-next-cc/next-cc'