Merge commit 'e2df70b60b84031d3ccd3ae799a4e3aa8112f3ff' into python3

Doc: Add about section (PR #33)

* added about section

* updated .gitignore to exclude doc/_build/

ERPC: fix SetTraceVariablesList interface

This fix debug not suspending when having no variables, and other debug error being not reported.

C++ runtime: WIP: untested PLCObject implementation. Still missing tracing.

Update revisions used in tests running on GitHub.

merge

C++ runtime: add eRPC server, minimal CLI and Makefile. WIP.

More documentation. Work in progress.

IDE: Fix crashing non-thread safe code using Zeroconf

BACnet: Fixed grid cell choice editor. Consequence of wxPython4.

SVGHMI: fix font embedding with py3

IDE: Fix Variable grid ignoring edits. WxPython4 consequence.

IDE: Remove all occurrences of deprecated wx.grid.PyGrid

Merge commit '80e123b34e488ffea851dc2168b366ba6124c09b' into python3

Doc: start converting Standard Library documentation from old MC8 manual.

merge

Modbus: fix test: add missing filles and add Modbus source+build in GH CI

Modbus: add CI test + test project

Doc: re-organize existing, sketch outline, add SVGHMI intro.

Examples: add svghmi_json_table

SVGHMI: add "DISCARD:" prefix to force discarding an SVG element

SVG: fix HMI:Assign widget to properly handle single-letter variable names.

SVGHMI: Fix wrong documentation copy-pasted in HMI:Page.

SVGHMI: add FlatButton with no active or inactive elements.

SVGHMI: i18n: minimize warnings for incomplete/fuzzy/outdated translations

SVGHMI: i18n: fix .POT generation + other cosmetic fixes.

merge

Removed forgotten debug print.

SVGHMI: fix py3 consequences on i18n

merge

SVGHMI: Fix thumbnail generation.

Tests: update svghmi test project to py3 and erpc

IDE: Fix local runtime not starting on windows.
Consequence of updating ProcessLogger's argument handling.

Add credits for Czech i18n

Shows AboutDialog even if revisions.tx is missing

IDE: Fix encrypted ERPC: newer TLS, better error handling, re-add explicit ERPCS scheme, use sslpsk better.

merge

IDE: display contents of revisions.txt (put there by installer builder script) in About Dialog.

eRPC Server: fix exception at disconnect and reconnecting

Merge pull request #31 from martinpihrt/python3

Czech translation from Martin Pihrt

Create Beremiz_cs_CZ.po

Create Beremiz.mo

Fix SVGHMI build exception on windows: return bytes for inkscape path in docsvg.

SVGHMI: fix consequence of last change in ProcessLogger

Update requirements.txt

Remove forgotten debug prints

merge

Updates requirements.txt about forks of Nevow and sslpsk

Fix deprecated WX call producing warning.

Fix exception on right click, showing context menu.

GCC toolchain: Add {SYSROOT} substitution with support for whitespaces

Any instance of {SYROOT} string in config's CFLAGS and LDFLAGS is replaced by sysroot path obtained from "gcc -print-sysroot"

Fix argument lexer in ProcessLogger, replace it with shlex standard python module.

SVGHMI: Fix warning with WxPython > 4.x

docsvg: safer version checking of Inkscape

IDE. update genicons.sh to inkscape 1.1 command line

IDE: adjust Build and Clean icons colors.

Fix variable forcing. Now works with eRPC. PLCObject API changed.

Fix strings displaying as repr(bytes) in debug view.

Fix variable tracing in new eRPC interface.

Replace PYRO with ERPC. Work In Progress.

Fix blind replace ('text' into 'str') from py3 port

Fix settings URL: now '/' instead of '/settings'

Merge

SVGHMI: Fixes UI lifecycle problems

Was sometime showing HMI tree of previously closed project : no more module globals to store hmi tree.
C++ dead object exceptions happened when re-opening SVGHMI UI or building after close of UI.