Eeschema: Make left - bottom corner as coordinate origin per installation default

Description

Once Y axis is allowed to increase upwards (#7570 (closed)), make left - bottom corner as coordinate start. This is default in most cad apps: Altium, inkscape, photoshop, freecad.

Steps to reproduce

1. Open fresh eeschema;
2. Hover on left bottom corner;
3. See that cursor is at X 0, Y 8250;
4. Hover on left top corner;
5. See that cursor is at X 0, Y 0;

#3 vs #5 should be inversed.

Relates to #7565 (closed), #7570 (closed), #5711 (closed), #5395.

KiCad Version

Application: Eeschema

Version: (5.99.0-9150-gfb5cd22cd0), release build

Libraries:
	wxWidgets 3.1.4
	libcurl/7.74.0-DEV Schannel zlib/1.2.11

Platform: Windows 10 (build 19042), 64-bit edition, 64 bit, Little endian, wxMSW

Build Info:
	Date: Feb 16 2021 12:06:17
	wxWidgets: 3.1.4 (wchar_t,STL containers)
	Boost: 1.75.0
	OCC: 7.5.0
	Curl: 7.74.0-DEV
	ngspice: 34
	Compiler: Visual C++ 1928 without C++ ABI

Build settings:
	KICAD_SCRIPTING=ON
	KICAD_SCRIPTING_MODULES=ON
	KICAD_SCRIPTING_PYTHON3=ON
	KICAD_SCRIPTING_WXPYTHON=ON
	KICAD_SCRIPTING_WXPYTHON_PHOENIX=ON
	KICAD_SCRIPTING_ACTION_MENU=ON
	KICAD_USE_OCC=ON
	KICAD_SPICE=ON