**BE NOT AFRAID**. I know that there's 107 files in this PR, but almost
all of it is just find/replacing `TerminalControl` with `Control`.
This is the start of the work to move TermControl into multiple pieces,
for #5000. The PR starts this work by:
* Splits `TerminalControl` into separate lib and dll projects. We'll
want control tests in the future, and for that, we'll need a lib.
* Moves `ICoreSettings` back into the `Microsoft.Terminal.Core`
namespace. We'll have other types in there soon too.
* I could not tell you why this works suddenly. New VS versions? New
cppwinrt version? Maybe we're just better at dealing with mdmerge
bugs these days.
* RENAMES `Microsoft.Terminal.TerminalControl` to
`Microsoft.Terminal.Control`. This touches pretty much every file in
the sln. Sorry about that (not sorry).
An upcoming PR will move much of the logic in TermControl into a new
`ControlCore` class that we'll add in `Microsoft.Terminal.Core`.
`ControlCore` will then be unittest-able in the
`UnitTests_TerminalCore`, which will help prevent regressions like #9455
## Detailed Description of the Pull Request / Additional comments
You're really gonna want to clean the sln first, then merge this into
your branch, then rebuild. It's very likely that old winmds will get
left behind. If you see something like
```
Error MDM2007 Cannot create type
Microsoft.Terminal.TerminalControl.KeyModifiers in read-only metadata
file Microsoft.Terminal.TerminalControl.
```
then that's what happened to you.
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