Move runincontext to src/tools

This SDK-style project is causing problems on some machines with VS
installs that can't build it.  For now, move it to a place where it
doesn't build with the tests.

diff --git a/tests/src/runincontext/runincontext.cs b/src/tools/runincontext/runincontext.cs
similarity index 100%
rename from tests/src/runincontext/runincontext.cs
rename to src/tools/runincontext/runincontext.cs

diff --git a/tests/src/runincontext/runincontext.csproj b/src/tools/runincontext/runincontext.csproj
similarity index 100%
rename from tests/src/runincontext/runincontext.csproj
rename to src/tools/runincontext/runincontext.csproj