CZ Signals Part 3

[detective-fiasco]

Hi there, I updated the rendering of Czech signals a bit.

There will definitely be further changes (especially concerning speed_limit signals), but this would be great to get online.
I can add images of what's changed with localhost preview links if necessary.

Here's a summary of what's changed:

• Organized the icons into folders per signal type (e.g. the part after CZ-D1:)

• For consistency, the descriptions of signals are now always in Czech

• Reworked icons and the logic behind choosing icons of combined/main light signals, distant light and shunting light signals.
  They now reflect the logic of 'display the most restrictive aspect except danger' (with the exception of auto-block signals, but this might get changed with the introduction of traversable). Also based on which states the signal can show, the most appropriate number of light bulbs is approximated.

• Updated icons:

  • resetting_switch is now differentiated by yellow outline, commonly used on this type of signal for better visibility
  • CZ-D1:stuj rectangle sign now has the same dimensions as all the other rectangular signs
  • CZ-D1:posun_zakazan simplified svg
  • CZ-D1:navestidlo_vykolejky added a black square background, for differentiation from posun_zakazan
  • CZ-D1:predvestnik_ns removed the 0 at the ones place - not actually there on speed_limit_distant signals
  • CZ-D1:predvestnik_ns + speed=none is now supported. (Konec platnosti rychlostníků NS)

• Added support for shortened speed_limit_distant signs.

• Added rendering of distant sign CZ-D1:tabulka_s_krizem (just added the entry into .yaml, icons were ready)

• Added support for newly established tag station_distant=CZ-D1:stanoviste_samostatne_predvesti. (Describes the board under distant light signals)

• Removed CZ-D1:serazovaci_navestidlo in favor of CZ-D1:seradovaci_navestidlo (all signals have been rettaged already)

• Partially changed the visualization of hlavni_navestidlo speed_limits to better reflect reality in most cases. Proper visualization of all possiblities needs better tagging.

• Updated visualizations to recognize as many of HaPe-CZs signals as possible such as when ref is unknown and replaced by '_' or similar cases. However, for these signals only the basic signal icon is displayed, no differentiation based on states or minor:function is done. This is a partial regression in functionality, but it keeps the .yaml clean*-ish*. By far the majority of recognized signals are shunting light signals and those do not require any differentiation.