TODO

- Makefile: Remove -g from CFLAGS
- src/grammar.y: Fix assignment/type of derived types
- src/grammar.y: Continue parsing after error
- src/grammar.y: Handle VAR_ACCESS, VAR_CONFIG definitions
- src/grammar.y: Review grammar error messages
- src/grammar.y: Review grammar to ensure all tokens are freed
- src/bytecode.c: Add support for negated output from functions
- src/standard.c: Add support for character string functions
- src: Determine method for system configuration beyond command line invocation?
- src: Simplify where possible and reduce dependency on dynamically allocated memory
- src: Fix function block instances within function blocks
- src: Add support for loading function block definitions from hexadecimal file
- src: Add support for function block signature validation
- src: Add Modbus server/client functionality
- src: Add DNP3 slave functionality
- src: Add MQTT client functionality