Ninja build broken when using commands with $-escaped characters

[claudiofantacci]

ninja build is broken with following error:
ninja: error: build.ninja:244: bad $-escape (literal $ must be written as $$)

The problem is the --switch $(COLOR) generated by CMake for the custom command in AddUninstallTarget and YCMEPHelper. Here is the list of such commands:

❯ git grep "(COLOR" ..
../modules/AddUninstallTarget.cmake:                  COMMAND "${CMAKE_COMMAND}" -E cmake_echo_color --switch=$\(COLOR\) --cyan "Uninstall the project..."
../modules/YCMEPHelper.cmake:                             COMMAND ${CMAKE_COMMAND} -E cmake_echo_color --switch=$(COLOR) --cyan "Working directory: ${source_dir}"
../modules/YCMEPHelper.cmake:    set(_source_cmd COMMAND ${CMAKE_COMMAND} -E cmake_echo_color --switch=$(COLOR) --cyan "${_name} SOURCE directory: "
../modules/YCMEPHelper.cmake:    set(_source_cmd COMMAND ${CMAKE_COMMAND} -E cmake_echo_color --switch=$(COLOR) --cyan "${_name} REPOSITORY directory: "
../modules/YCMEPHelper.cmake:                    COMMAND ${CMAKE_COMMAND} -E cmake_echo_color --switch=$(COLOR) --cyan "${_name} SOURCE directory: "
../modules/YCMEPHelper.cmake:  set(_binary_cmd COMMAND ${CMAKE_COMMAND} -E cmake_echo_color --switch=$(COLOR) --cyan "${_name} BINARY directory: "

Possible solutions:

1. Remove them
2. use $$\(COLOR\)
3. use $\{COLOR\}

Related issue robotology/robotology-superbuild#83

[claudiofantacci]

cc @diegoferigo

[drdanz]

Should be fixed in f2c61b1