Rendering performance improvements

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Main changes:

• Total rework of internal logic of unit counters to allow lazy and more conservative update of counters data.
• Borders generation is reworked to ensure consistent orientation.
• • Consistent orientation allows to simplify borders weaving logic and make it more robust
• Split borders into distinct groups: Province, state, national.
• • Allows usage of more performant OpenGL API related to indirect rendering. In the result map rendering time is reduced to nothing
• • During map update only data related to national borders has to be uploaded back to GPU, the rest of the border meshes are static
• Improve management of colonization labels by splitting them into groups. Group is rendered and updated only if there is some colonization going on locally.