allow themed room subrooms to be filled (github #347)
allow rereading spellbooks to refresh memory at any time (github #261)
allow themed rooms constrained by level difficulty (github #344)
-add a varied form of LIBNH nethack library contribution (github #385)
-add cross-compile to WASM (github #385)
+add a varied form of LIBNH nethack library contribution (github #385, #403)
+add cross-compile to WASM (github #385, #403)
Code Cleanup and Reorganization