Describe the bug

Using any characters that are not legal for C identifiers in the project names causes compiler errors (except (space) which is handled already).

To Reproduce
Steps to reproduce the behavior:

1. Create a new C/C++ Project
2. Choose CMake project (the small Hello World example)
3. Create a project name with - (dashes) in it
4. Attempt to build project

For example, call the project example-cmake-project and observe that the config.h.in is invalid C code:

#define example-cmake-project_VERSION_MAJOR @example-cmake-project_VERSION_MAJOR@
#define example-cmake-project_VERSION_MINOR @example-cmake-project_VERSION_MINOR@

PR #105 introduced the config.h.in file and it does have special handling for spaces, but needs it for other characters too:

cc: @mbooth101