SVGHMI: i18n: minimize warnings for incomplete/fuzzy/outdated translations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