Fix script execution issues and improve container creation

- Fixed syntax errors in build.func (duplicate export, unmatched quotes)
- Fixed color variable initialization by calling load_functions in core.func
- Replaced undefined function calls (post_to_api, post_update_to_api) with echo statements
- Fixed install script execution by copying scripts into container first
- Made create_lxc.sh executable
- Improved error handling and script sourcing
- Added missing core functions and tools
- Enhanced script downloader and local script management

scripts/core/core.func

@@ -406,4 +406,7 @@ check_or_create_swap() {
   fi
 }
 
-trap 'stop_spinner' EXIT INT TERM
+trap 'stop_spinner' EXIT INT TERM
+
+# Initialize functions when core.func is sourced
+load_functions