Introduction + Obsolete dates for signals and industries.

[OpenRailer90]

SIGNALS:

Colorlights:

SIGC3 - 3-aspect Colourlight, British style
(1930-XXXX)
--------------------------------------------
SIGC4 - 4-aspect Colourlight, British style
(1960-XXXX)
--------------------------------------------
SIGCSW - Colorlight, Swiss style
(1930-XXXX)
--------------------------------------------
SIGCUS - Colorlight, American style
(1930-XXXX)

==============================================================

Semaphores:

SIGS - Semaphore UQ UpperQuadrant, British style
(XXXX-1965)
--------------------------------------------------------------
SIGSD - Semaphore UQD UpperQuadrant w/ Distant, British style
(XXXX-1965)
--------------------------------------------------------------
SIGSDL - Semaphore LQD LowerQuadrant w/ Distant, British style
(XXXX-1945)
--------------------------------------------------------------
SIGSL - Semaphore LQ LowerQuadrant, British style
(XXXX-1945)
--------------------------------------------------------------
SIGSUS - Semaphore, American style
(XXXX-1955)
--------------------------------------------------------------
SIGSW - Semaphore, Swiss Style
(XXXX-1955)

INDUSTRIES (All except these available forever):
Coalmine: up to 2005

Oilwell: up to 2018
Oilrig: 1940-2018

Flourmill: up to 1940s


This is for people who want to know the introduction and obsoletion dates for signals and industries. Feel free to add any 3rd party ones (Like Provo, NL set signals)