COMP: Update to specific git_tags for external projects

Using a git branch name for an external project would
update the repository of that external project when
building iMSTK even though it would not be tested.

By hardcoding a certain commit #, we can make sure we
need to specifically update the external project git_tag
to update the external project.

This commit updates to the newer version of VegaFEM which
should resolve some errors:

iMSTK/VegaFEM-CMake@d1ab0858

CMake/External/External_LibNiFalcon.cmake

@@ -9,7 +9,7 @@ endif(WIN32)
 include(imstkAddExternalProject)
 imstk_add_external_project( LibNiFalcon
   GIT_REPOSITORY https://github.com/agirault/libnifalcon
-  GIT_TAG libusb1-windows
+  GIT_TAG 47586d4e21c987fb9e3ce822bf707c53e8fc4e52
   INSTALL_COMMAND ${SKIP_STEP_COMMAND}
   CMAKE_ARGS
     -DBUILD_TESTING:BOOL=OFF

CMake/External/External_SCCD.cmake

@@ -4,7 +4,7 @@
 include(imstkAddExternalProject)
 imstk_add_external_project( SCCD
   GIT_REPOSITORY git@gitlab.kitware.com:iMSTK/SCCD.git
-  GIT_TAG iMSTK
+  GIT_TAG 7145cc437ff9f9744a8363736590260e2e660bb6
   INSTALL_COMMAND ${SKIP_STEP_COMMAND}
   CMAKE_ARGS
     -DBUILD_SAMPLE_APP:BOOL=OFF

CMake/External/External_VRPN.cmake

@@ -31,7 +31,7 @@ endif()
 include(imstkAddExternalProject)
 imstk_add_external_project( VRPN
   GIT_REPOSITORY https://github.com/agirault/vrpn
-  GIT_TAG improve-openhaptics
+  GIT_TAG 63ccb99d7f9e59d594716fd530ceac99b1ed7fbc
   INSTALL_COMMAND ${SKIP_STEP_COMMAND}
   CMAKE_ARGS
     -DBUILD_TESTING:BOOL=OFF

CMake/External/External_VTK.cmake

@@ -4,7 +4,7 @@
 include(imstkAddExternalProject)
 imstk_add_external_project( VTK
   GIT_REPOSITORY git@gitlab.kitware.com:iMSTK/vtk.git
-  GIT_TAG multi-textures
+  GIT_TAG 82896a55877fc060a0f0207dea10677f7d425f38
   INSTALL_COMMAND ${SKIP_STEP_COMMAND}
   CMAKE_ARGS
       -DBUILD_EXAMPLES:BOOL=OFF

CMake/External/External_VegaFEM.cmake

@@ -9,7 +9,7 @@ endif(WIN32)
 include(imstkAddExternalProject)
 imstk_add_external_project( VegaFEM
   GIT_REPOSITORY git@gitlab.kitware.com:iMSTK/VegaFEM-CMake.git
-  GIT_TAG iMSTK
+  GIT_TAG d1ab0858675d9dbc64345038b3e25cac19b99bbe
   INSTALL_COMMAND ${SKIP_STEP_COMMAND}
   CMAKE_ARGS
     -DVegaFEM_ENABLE_PTHREADS_SUPPORT:BOOL=ON