Raise spell slots to 6

[meszaros-lajos-gyorgy]

The number of spell slots are maximized at 3 at the moment, either raise that to 6 or provide a way for the mod to raise it to 6.

[meszaros-lajos-gyorgy]

The numeric keys would require change too. The game only triggers pre-cast spells using the number keys 1, 2 and 3, while 4 is to cancel one of the current spells.

We could have up to 9 slots to control the 9 number keys. 0 is abligious for different keyboard layouts: on hungarian keyboards the 0 is to the left of 1 and the key after 9 is ö, while on english keyboards the 0 comes after 9 on the right.

The cancel spell key by default could be changed from 4 to backspace by default, similarly to Thief 1's clear inventory hotkey.

[meszaros-lajos-gyorgy]

This is how it looks in the current version of Insanity

[meszaros-lajos-gyorgy]

Possible fu*kups as noted in Krisz's changelog:

• Fix the correct space between spell icons, should be the same, interacting with the inventory animations and not overlay other hud icons
• Fix a bug with already stored spells dissapearing after load a saved game or change the level