This add a system for adding generic instances of the DynamicSEXP class
to the SEXP system. The only implementation at the moment is the LuaSEXP
which is used by the mn.addSEXP lua API to allow Lua to add new SEXPs.
Since this requires that FRED also runs lua scripts I added a mod table
option to enable scripting in FRED. Since the current scripts are not
built with FRED in mind it would likely break all these scripts if FRED
would be opened with normal scripting enabled.
This fixes#1320.
This allows to use the XSTR mechanism in script to make translating
script text possible. This is compatible with the existing XSTR format
so automatic tstrings.tbl generator tools should work fine with this.
This resolves point 2 of #1522.
asarium