build: Beautify cmake files

Add the formatter config file (.cmake-format.py) and run:
cmake-format -i CMakeLists.txt

.cmake-format.py

@@ -0,0 +1,34 @@
+# Configuration for cmake-format (v0.3.6, circa Apr 2018)
+# https://github.com/cheshirekow/cmake_format
+
+# How wide to allow formatted cmake files
+line_width = 132
+
+# How many spaces to tab for indent
+tab_size = 4
+
+# If arglists are longer than this, break them always
+max_subargs_per_line = 3
+
+# If true, separate flow control names from their parentheses with a space
+separate_ctrl_name_with_space = False
+
+# If true, separate function names from parentheses with a space
+separate_fn_name_with_space = False
+
+# If a statement is wrapped to more than one line, than dangle the closing
+# parenthesis on it's own line
+dangle_parens = False
+
+# What character to use for bulleted lists
+bullet_char = u'*'
+
+# What character to use as punctuation after numerals in an enumerated list
+enum_char = u'.'
+
+# What style line endings to use in the output.
+line_ending = u'unix'
+
+# Format command names consistently as 'lower' or 'upper' case
+command_case = u'lower'
+

CMakeLists.txt

@@ -30,10 +30,8 @@ install(DIRECTORY "${CMAKE_SOURCE_DIR}/registry" DESTINATION ${CMAKE_INSTALL_DAT
 
 # uninstall target
 if(NOT TARGET uninstall)
-    configure_file(
-        "${CMAKE_CURRENT_SOURCE_DIR}/cmake/cmake_uninstall.cmake.in"
-        "${CMAKE_CURRENT_BINARY_DIR}/cmake_uninstall.cmake"
-        IMMEDIATE @ONLY)
-    add_custom_target(uninstall
-        COMMAND ${CMAKE_COMMAND} -P ${CMAKE_CURRENT_BINARY_DIR}/cmake_uninstall.cmake)
+    configure_file("${CMAKE_CURRENT_SOURCE_DIR}/cmake/cmake_uninstall.cmake.in" "${CMAKE_CURRENT_BINARY_DIR}/cmake_uninstall.cmake"
+                   IMMEDIATE
+                   @ONLY)
+    add_custom_target(uninstall COMMAND ${CMAKE_COMMAND} -P ${CMAKE_CURRENT_BINARY_DIR}/cmake_uninstall.cmake)
 endif()