Remove integer keys from lush table, use string lookups (issue #29)

VM now resolves lush functions via luaH_getshortstr through interned
TString pointers, so wrapping lush.command = my_wrapper is transparently
picked up. The lush table no longer has integer-keyed duplicates.

issues/29-lush-table-cleanup.md

@@ -1,6 +1,6 @@
 # Issue 29: Clean Up Integer Keys in lush Global Table
 
-**Status:** open
+**Status:** done
 
 ## Problem