File cleanup. Remove Incursion.txt which duplicates README.txt to som…

…e degress. Remove obsolete build.bat. Update Changelog for #27.

Changelog.txt

@@ -1,4 +1,5 @@
-Incursion (open source) 0.6.9Y20: 2015-??-??
+Incursion (open source) 0.6.9Y20: 2024-??-??
+* https://github.com/rmtew/incursion-roguelike/issues/27: The code assumed that on a day passing there would never be more than 2048 objects per map. Popo McTroll reported on Julian's old email list that he managed to get this upwards of 3000. The code should now handle whatever number have accrued. Fixed by https://github.com/HexDecimal.
 * https://bitbucket.org/rmtew/incursion-roguelike/issues/244/: Consistency changes and fixes to spelling throughout the game text.  This also renames the Flat-Footed concept to Off-Guard, inspired by the notion snakes and other creatures may not have feet to be flat.  Pull request from Dave Duckett.
 * https://bitbucket.org/rmtew/incursion-roguelike/issues/246/: The build.bat script has been upgraded significantly. It now supports 'build-project'/'-bp' which replaces the old never implemented 'project'/'-p'.  And it also supports user functions, which are dynamically handled along with the standard ones, and it's used for 'compile-scripts'/'-cs' which can of course be used to compile 'Incursion.mod'.  This might currently be the only way to compile the scripts.
 * https://bitbucket.org/rmtew/incursion-roguelike/issues/248/: Incursion now has an x64 configuration and with minor complications compiles and starts up.  Note that there are a lot of compilation warnings, so stability is questionable.  The x64 compilation requires some finessing, as modaccent is a very dated codebase that crashes hard when run as an x64 executable.  But the Win32 binary does exactly the same thing.  The exe_curses project is disabled for x64, as it only comes able to compile for Win32.  As it's not really usable, this isn't much of a loss.