MicroTBX-Modbus version 1.0.0

• Implemented unit tests and run them automatically with GitHub actions.
• Overall refactoring and improvements as a result of unit testing.
• Use the new TbxMemPoolAllocateAuto().
• Improved the pollerList in TbxMbEventTask().
• Added new TbxMbOsalEventPurge() to remove events from a context when free-ing it.
• Public release of version 1.0.0.