Re-arrange widgets for text source display panel

Change-Id: Ia3e64686d672fe02ffdf0c67eb1ce2c420fe980b
Renamed pqTextWindowLocationWidget to pqTextLocationWidget

Change-Id: Iec86a4c3b7043ace4d2b0aa1b575951ee3f12940
Use new display panel for spreadsheet view

Change-Id: I3d4911065c0103798f16b02483bf8c7aa09b247e
Remove legacy display panel for Text Source

Change-Id: I055cf6f44e3607c40b62915a15bbf1843a2c592a

Renamed interface

Change-Id: I0b66a104b218b1349defc5c31a0f90e19b503be6