cmake: Clarify GetCommonName() and plugin naming.

CMakeLists.txt

@@ -24,7 +24,7 @@ set(OpenGL_GL_PREFERENCE "LEGACY")
 PROJECT(oesenc_pi)
 
 SET(PACKAGE_NAME oesenc_pi)
-SET(VERBOSE_NAME oesenc)
+SET(COMMON_NAME oeSENC)     # Must be the same as returned by GetCommonName()
 MESSAGE (STATUS "*** Building ${PACKAGE_NAME} ***")
 
 include("VERSION.cmake")
@@ -35,7 +35,7 @@ SET(PKG_API_VERSION "1.16")
 SET(PKG_AUTHOR "David S Register")
 
 # NVR: <Name-version>[-release]
-SET(PKG_NVR ${PACKAGE_NAME}-${PACKAGE_VERSION})
+SET(PKG_NVR ${COMMON_NAME}-${PACKAGE_VERSION})
 
 # The @keyword@ references are patched to actual values by upload script.
 SET(TARBALL_URL "https://dl.cloudsmith.io/public/@pkg_repo@/raw")
@@ -181,7 +181,6 @@ if (OCPN_FLATPAK)
       ${CMAKE_SOURCE_DIR}/pkg_version.sh.in
       ${CMAKE_CURRENT_BINARY_DIR}/pkg_version.sh
     )
-    set(PLUGIN_NAME ${VERBOSE_NAME}-plugin-${PKG_TARGET}-${PKG_TARGET_VERSION})
 
     find_program(TAR NAMES gtar tar)
     if (NOT TAR)
@@ -599,9 +598,9 @@ configure_file(
   ${CMAKE_CURRENT_BINARY_DIR}/pkg_version.sh
 )
 
-set(PLUGIN_NAME ${VERBOSE_NAME}-plugin-${PKG_TARGET}-${PKG_TARGET_VERSION})
+set(XML_NAME ${COMMON_NAME}-plugin-${PKG_TARGET}-${PKG_TARGET_VERSION})
 
 configure_file(
   ${CMAKE_SOURCE_DIR}/oesenc-plugin.xml.in
-  ${CMAKE_CURRENT_BINARY_DIR}/${PLUGIN_NAME}.xml
+  ${CMAKE_CURRENT_BINARY_DIR}/${XML_NAME}.xml
 )