editor: game running badge and stop game button during play-tests, crosshair for play from camera position while shift is held, readable outliner names, plain error dialogs with details and no stuck loading status, inspector hints wrap with the dock

docs/manual/15-build-play.md

@@ -53,6 +53,10 @@ status bar keeps the result of the last build; click it to open the Problems pan
 
 ![The game started straight in the level](img/play_boot.jpg)
 
+While the game runs, the editor says so: the status bar shows a green **Game running: …**
+badge and the toolbar's **Play** button turns into **Stop game** (click it to quit the game). Both
+go back to normal a moment after the game has ended.
+
 In the game, press **Escape** to quit straight back to the editor. When the game has ended,
 LlamaMod switches your normal mod selection back on and deletes the temporary copy – play-tests
 do not fill LlamaMod's mod list. While the game runs, the copy shows up in LlamaMod as
@@ -69,6 +73,10 @@ in LlamaMod**.
 of the view, facing the way the camera looks. Point the view at the spot you want to test – a
 difficult jump, the end of a parkour – and press **Shift+F5**.
 
+While you hold **Shift** (or point at **Play from camera position** in the toolbar or the Level
+menu), a small **crosshair** marks the middle of the view: **green** means the llama can start
+there, **red** means it cannot – the status bar says why.
+
 ![The llama starting where the editor camera looked](img/play_from_here.jpg)
 
 The editor checks that there is walkable **collision** at that point: many things that look solid