Moved analyzer tests to its own project

Also moves tests to `./test` which makes it possible
for all test projects to share the same .editorconfig
files and similar.

test/Spectre.Console.Tests/Expectations/Widgets/Table/Render_Impossible.Output.verified.txt

@@ -0,0 +1,12 @@
+╭───────┬───────┬───────╮
+│ ┌───┐ │ ┌───┐ │ ┌───┐ │
+│ │ A │ │ │ D │ │ │ G │ │
+│ │ B │ │ │ E │ │ │ H │ │
+│ │ C │ │ │ F │ │ │ I │ │
+│ └───┘ │ └───┘ │ └───┘ │
+├───────┼───────┼───────┤
+│ Hello │ World │       │
+│ …     │ Whaat │   Lol │
+│ Hej   │ Värld │       │
+│       │ en    │       │
+╰───────┴───────┴───────╯