Fix cmake script to compile as submodule#399

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maxvgi wants to merge 6 commits intoCopernicaMarketingSoftware:masterfrom maxvgi:compile-as-submodule

Commits on Dec 20, 2018

Cmake: joined phpcpp-common and phpcpp libraries in single library to be able to use it statically in linux
Maxim Leontyev
committed
Move headers to be able to use without installation
Maxim Leontyev
committed
Documentation for cmake
Maxim Leontyev
committed
Fix headers paths in sources after moving header files
Maxim Leontyev
committed
Minor fixes and checks to cmake and documentation
Maxim Leontyev
committed
Add cmake flag description to cmake comments
Maxim Leontyev
committed