BaseTools: Use pip module if available, CI uses it by default

Use the new edk2-basetools pip module.
Includes a helpful message in setup to let users know which has been
selected.

Cc: Bob Feng <bob.c.feng@intel.com>
Cc: Liming Gao <gaoliming@byosoft.com.cn>
Cc: Yuwei Chen <yuwei.chen@intel.com>

Reviewed-by: Bob Feng <bob.c.feng@intel.com>
Reviewed-by: Yuwei <Chen<yuwei.chen@intel.com>

Signed-off-by: Matthew Carlson <matthewfcarlson@gmail.com>

pip-requirements.txt

@@ -14,4 +14,5 @@
 
 edk2-pytool-library==0.10.*
 edk2-pytool-extensions~=0.13.3
+edk2-basetools==0.1.2
 antlr4-python3-runtime==4.7.1