While at it, use D3D-like uniforms for the light parameters and
(consequently) implement range and proper D3D spotlights support.

It's only an implementation detail that the direction needs to be passed
to the fixed function GL pipeline as GL_POSITION.

It's a direction so we don't want to get translations applied to it.
The variable is only used internally.

Some applications don't forward WM_SIZE to the window proc.

The dates were changed some time ago. DST starts now on the second
Sunday in March and ends on the first Sunday in November.

Clocks are changed at 02:00 and not 00:01.

According to the publicly available information, DST should
start on the first Sunday in September, not the second.

The following timezones do not have daylight saving time anymore.

Asia/Baghdad       - last DST in 2007
Asia/Yerevan       - last DST in 2011
Europe/Minsk       - last DST in 2011
Asia/Yekaterinburg - last DST in 2011
Asia/Novosibirsk   - last DST in 2011
Asia/Irkutsk       - last DST in 2011
Asia/Krasnoyarsk   - last DST in 2011
Europe/Moscow      - last DST in 2011, changed in 2014
Asia/Vladivostok   - last DST in 2011
Australia/Perth    - last DST in 2009
Asia/Yakutsk       - last DST in 2011