way better lock-check error messages

[borisbat]

EXCEPTION: table can't be indexed at because it contains locked elements
object type<table<string,array<int>>>(null) contains locked elements (count=1) and can't be modified (resized, pushed to, inserted to, erased from, cleared, deleted, moved, or returned via move)    
 at D:\Work\daScript/examples/test/misc/hello_world.das:10:18