i was looking for example for ttcn3 and gnu assembler syntax.
Ok - at least for the first you need to update scintilla, indeed. Note
scintilla first, not wxScintilla. I would suggest you talk to the maintainer of scintilla first (Neil Hodgson, "nyamatongwe",
https://sourceforge.net/projects/scintilla/develop) to see if he is willing to support such lexers. To be honest: If thats not the case it is unlikely that we will start a fork as it will be very hard to maintain (we already have too much customisations for the base scintilla).
If he is willing (he may also give you some guidelines) come back here and we'll see how we can support that.
We will be happy (however) to host patches in that direction for other users...