[Done for V0.45] optimizing RTC module format

[linflas]

i remember that RTC modules files are some kind of big zip archive containing source and new stuff.
as FoD.RTC is about 20Mb and i have completed approximately 20% of the new bitmaps and 50% of the new sounds and musics, i was wondering if it could be possible to gain a few kbytes (and especially compilation time !) by adding some of these suggestions :
- if i use a bitmap for left view, i don't have to add another bitmap for the right view but instead, saying to RTC that it is the horizontal opposite of the left view. this is mostly happening for "entrance_from_xxx_to_yyy_direction" flooritems.
- adding to config.txt or somewhere else, a COMPILE_WITHOUT_SOUND tag (please!).
EDIT : of course, if some of the sounds are triggered in the dungeon, they should work but don't play because they are 0kb sized.
- if a file (bitmap or sound) is used twice or more, i don't know if it is included only once in the compiled RTC module, but if not, it should be.

maybe people have other suggestions like these ?

[linflas]

i've just tested the 3rd point by adding a bitmap with some position values and adding again the same bitmap with different position value s and a different name : the RTC file grows.

[George Gilbert]

Done the 2nd & 3rd suggestions for V0.45

[linflas]

the TEST tag is a godsend ! thanks in dvance for the hundred of hours i will gain