Automatic merge of T1.4-662-g712b9e5f5 and 16 pull requests

- Pull request #537 at e88581e: C# signal script extensions
- Pull request #570 at 824f96f: Experimental glTF 2.0 support with PBR lighting
- Pull request #630 at 704731a: Sky Color Fix (Addresses Trello Roadmap Card #367 for More accurate sunrise and sunset)
- Pull request #650 at 3f8380c: Renewed Russian translation up to testing T1.4-598 version
- Pull request #652 at 918fdb1: Add button functions to Raildriver
- Pull request #667 at aa5c629: Fix typo in Czech translation of menu
- Pull request #675 at 9664141: Bug fix for https://bugs.launchpad.net/or/+bug/1983511 When an AI train disappears at end of run, containers remain visible
- Pull request #677 at a1dc40b: Correct double heading bug
- Pull request #678 at c19e718: Refactor TrainCar part 1
- Pull request #679 at 223aae6: Provide travelled distance to TCS scripts taking into account the running direction
- Pull request #681 at c5cc067: test: Fix tests when StfReader tests run before JsonReader tests
- Pull request #684 at 3f4cc62: fix: Clean up Data Validator help output to match dotnet-style
- Pull request #685 at 203bbd2: fix: Clean up Data Converter help output to match dotnet-style
- Pull request #686 at dab3e59: fix: Clean up Data Collector help output to match dotnet-style
- Pull request #687 at 2cbce1f: fix: Clean up Content Checker help output to match dotnet-style
- Pull request #688 at e44897d: adds Help Icons to Video tab

Source/Locales/Menu/cs.po

@@ -309,7 +309,7 @@ msgstr "Instalační profil:"
 
 #: ../../Menu/MainForm.Designer.cs:366
 msgid "Documents ▼"
-msgstr ""
+msgstr "Dokumenty"
 
 #: ../../Menu/MainForm.Designer.cs:378
 msgid "Mode:"
@@ -345,7 +345,7 @@ msgstr "Konec trasy:"
 
 #: ../../Menu/MainForm.Designer.cs:558
 msgid "Duration:"
-msgstr "Dobra trvání:"
+msgstr "Doba trvání:"
 
 #: ../../Menu/MainForm.Designer.cs:569
 msgid "Time:"
@@ -361,7 +361,7 @@ msgstr "Obtížnost:"
 
 #: ../../Menu/MainForm.Designer.cs:665 ../../Menu/MainForm.Designer.cs:788
 msgid "Season:"
-msgstr "Roční doba:"
+msgstr "Období:"
 
 #: ../../Menu/MainForm.Designer.cs:697
 msgid "Train:"
@@ -965,7 +965,7 @@ msgstr "Náhodné nastavení počasí"
 
 #: ../../Menu/Options.Designer.cs:1691
 msgid "Activity randomization"
-msgstr "Infromace o aktivitě "
+msgstr "Informace o aktivitě "
 
 #: ../../Menu/Options.Designer.cs:1724
 msgid "Correct questionable braking parameters"