Change: rebrand 1.12.0 to 12.0

One question that keeps popping up: "when do we release 2.0?".
NewGRF will force that at least 1.16 will be 2.0, but to not wait
for this, let's drop the "1." and be for ever done with that
conversation.

We are following in the footstep of giants here.

CMakeLists.txt

@@ -5,7 +5,7 @@ if(NOT BINARY_NAME)
 endif()
 
 project(${BINARY_NAME}
-    VERSION 1.12.0
+    VERSION 12.0
 )
 
 if(CMAKE_SOURCE_DIR STREQUAL CMAKE_BINARY_DIR)
@@ -76,7 +76,6 @@ add_custom_target(find_version
                 -DCPACK_BINARY_DIR=${CMAKE_BINARY_DIR}
                 -DREV_MAJOR=${PROJECT_VERSION_MAJOR}
                 -DREV_MINOR=${PROJECT_VERSION_MINOR}
-                -DREV_BUILD=${PROJECT_VERSION_PATCH}
                 -DWINDOWS=${WIN32}
                 -P "${CMAKE_SOURCE_DIR}/cmake/scripts/FindVersion.cmake"
         WORKING_DIRECTORY ${CMAKE_SOURCE_DIR}