MQTT: WIP, now connects to broker. Added MQTT 3 support and protocol version selection in IDE.

MQTT: (WIP) Fix OpenSSL linking.

MQTT: still WIP, generated C code builds and link.

Extensions: add optional arguments to ThirdPartyPath

ThirdPartyPath("name", "path1", "path2") will resolve by default into "../name/path1/path2"

GCC BUILD: Prevent Memory Error when compiling huge projects.

Also deleted dead code.

MQTT WIP: intermediate state, added perfect hash to map topic to variables

MQTT WIP: intermediate state, implementing MQTT client C code generator.

WIP: Add skeleton for MQTT extension based on part of OPC-UA extension.

For now generated code makes no sense but persistently-configurable-C-generating-extension infrastructure is there.

Merge remote-tracking branch 'origin/python3' into python3

C runtime: Fix PLCObject.hpp preventing build.

IDE: generalize EVT_GRID_CELL_CHANG{ING->ED} (WxPy4)

IDE: hopefully last fix about float type being passed to WxPy4.

IDE: enhance variable forcing contextual menu

IDE: fix completion

uses ctrl key on Mac
update internal variable list before listing them
avoid exception if empty list
apply selection when pressing return or enter

IDE: Workaround some reported WxPython/MacOS problems.

SetSelection should be used instead of SetStringSelection , and FindString must use case_sensitive=True

IDE: Fix search result not showing single occurrences

IDE: remove warning if editing location leads to no change

IDE: Use 8x8 grid by default

IDE: Fix exception when connecting complex types

LocalRuntime: no crash if zombie PLC prevents erasing workdir

IDE: Fix printing

More side effects of WxPy4 et Py3 + workaround WxWidget bug.

IDE: failsafe escaping for input not matching utf-8 encoding

Update Nevow revision in requirements.txt

Merge commit '2d061a66ddc737f5dffae82413b4f8573b7eee54' into HEAD

Add "CONTINUE" ST statement.

Matches "Add CONTINUE statement, fix FOR loop accordingly" 8a06b3bb92967b389466b8afa977a995ec605e2d commit in Matiec.

C runtime: cosmetic changes

merge again

Revert unwanted changes potentially breaking wxGlade support.
Partly revert 34d4c77ccb1bcb14601ab347ec6080466b7e143d. Skips evaluator related changes that was included by mistake.

Tests: add erpc source to GitHub tests

C runtime: add autoload