Auto-rename symbols that use reserved words

[phobos2077]

Due to sfall sslc adding a bunch of new reserved words (like div), sometimes older scripts use this name for procedures and variables. So such scripts can't be re-compiled again without renaming those symbols.

There are 2 ways to fix this:

• Add "legacy" mode to sfall sslc, so for older scripts you can just disable new fancy syntax and compile without the new reserved words.
• Add auto-rename after decompile to int2ssl (just add some random number to procedure name to avoid collisions).