Update: Updated changelog based on... (#6835)

...the changelog in release 1.8 branch.

changelog.txt

@@ -1,3 +1,44 @@
+1.8.0 (2018-04-01)
+------------------------------------------------------------------------
+(None)
+
+
+1.8.0-RC1 (2018-03-21)
+------------------------------------------------------------------------
+- Feature: [GFX] Climate-specific Action5 extra airport sprites [FS#6664] (r27976)
+- Feature: Draw vertical separators at tile distance in the train depot GUI (r27938, r27899)
+- Feature: [Build] MSVC 2017 project file generator. Most noticeable, std:c++latest is enabled (r27920, r27919, r27918, r27917)
+- Feature: [Build] Project file generator for kdevelop 4/5 [FS#6577] (r27897)
+- Feature: Add option to close windows with right click [FS#4950] (r27826, r27825)
+- Feature: Vehicle Group Info: Add profits and occupancy display to group vehicle list (r27822)
+- Feature: Display aircraft type in vehicle preview/purchase/detail windows (r27802, r27799, r27797)
+- Change: [NewGRF] Various performance improvements to resolving VA2 (r27989, r27985, r27984, r27983, r27982)
+- Change: [NewGRF] Increase maximum allowed vehicle sprite size to reduce clipping of ships (r27987)
+- Change: Check companies for bankruptcy before subtracting reoccuring monthly costs [FS#6679] (r27981)
+- Change: [GFX] Replace the office building sprite on various toyland airports with a better fitting sprite [FS#6664] (r27977)
+- Change: [GFX] The switch-toolbar icon contained pixels from the fire cycle. Replace the whole icon with a new version [FS#6654] (r27961)
+- Change: Reword texts in industry view, when stockpiling is used (r27952)
+- Change: Remove the gap between windows when positioning them after opening [FS#6568] (r27934, r27900)
+- Change: [Build] Enable usage of static_assert for MSVC (r27916)
+- Change: [Build] Preserve PKG_CONFIG_PATH and PKG_CONFIG_LIBDIR environment variables in config.cache file [FS#6614] (r27902)
+- Change: Do not cancel headquarter construction and engine-preview-query when shift-clicking (r27889)
+- Change: Parse extmidi command string for parameters to pass on (r27834)
+- Change: Draw images in centre of buttons (r27829, r27821)
+- Fix: Store the map variety setting in the savegame like the other mapgen settings, so restarting maps considers it [FS#6673] (r27978)
+- Fix: Hair selection was missing one option [FS#6642] (r27975)
+- Fix: Avoid tile operations outside map border when building lock [FS#6662] (r27973)
+- Fix: Catenary sprites got mixed up for depots [FS#6670] (r27972)
+- Fix: Make automatic window-positioning RTL-aware (r27934, r27900)
+- Fix: Automatic window-positioning now uses GUI-scale/style dependent sizes/distances instead of fixed pixel values (r27934, r27900)
+- Fix: [NewGRF] While executing random triggers, var 5F should include the new triggers (r27928)
+- Fix: [NewGRF] Reset used random triggers only after all A123 chains have been resolved, so that all RA2 in all chains can test the shared triggers (r27928)
+- Fix: [NewGRF] Industry random triggers are stored per tile, even when randomising the shared random bits of the parent industry (r27928)
+- Fix: [NPF] Reserved track bits were not accounted for when trying to find any safe position (r27912)
+- Fix: Do not modify argv[0] [FS#6575] (r27886)
+- Fix: Do not search directories when opening ini files as we already have their full path [FS#6421] (r27816)
+- Fix: Road tunnel/bridge heads have no trackbits wrt. catenary drawing (r27812)
+
+
 1.7.2 (2017-12-24)
 ------------------------------------------------------------------------
 (None)