Fix issue #829 "Compiler crashes when declaring maps with procedure"

Inits `o->value` in `check_expr_base_internal()` so doesn't accidentally
  use last (the proc lit was being set to that of previous string)
Adds test to "tests/issues" and changes CI to use new "run" shells

tests/issues/run.bat

@@ -0,0 +1,17 @@
+@echo off
+
+if not exist "tests\issues\build\" mkdir tests\issues\build
+
+set COMMON=-collection:tests=tests -out:tests\issues\build\test_issue
+
+@echo on
+
+.\odin build tests\issues\test_issue_829.odin %COMMON%
+tests\issues\build\test_issue
+
+.\odin build tests\issues\test_issue_1592.odin %COMMON%
+tests\issues\build\test_issue
+
+@echo off
+
+rmdir /S /Q tests\issues\build