ide/debugger; compiler/libec: (#19, #456) Fixed watches memory leaks, improved errors

ide/debugger; compiler/libec: (#19, #456) Fixed watches memory leaks, improved errors
- Fixed setting 'constant' regardless of error type (only used for memoryErrorExp)
- Freeing data for debugger error expressions
- Fixed some memory errors missing addresses
- Making use of dereferenceError
- Improved evaluation pathways to resolve in less unknown errors
- Treating both class and struct members expression errors the same way