Initial support for C and C++

[rahlk]

• Generate C name-resolution based callgraph #86
• Create a builder C project and obtain CompilationDatabase #87
• Create symbol table for C #88

Implement Clang analysis methods to populate following C Model fields

• CTypeDef #89
• CEnum #90
• CMacro #91
• CStrut #92
• CFunctionPointer #93

Implement CAnalysis accessors:

• CAnalysis.get_c_application
• CAnalysis.get_imports
• CAnalysis.get_variables
• CAnalysis.get_application_view
• CAnalysis.get_symbol_table
• CAnalysis.get_compilation_units
• CAnalysis.get_call_graph #94
• CAnalysis.get_call_graph_json #95
• CAnalysis.get_callers
• CAnalysis.get_callees
• CAnalysis.get_functions
• CAnalysis.get_function
• CAnalysis.get_C_file
• CAnalysis.get_C_compilation_unit
• CAnalysis.get_functions_in_file
• CAnalysis.get_macros
• CAnalysis.get_macros_in_file
• CAnalysis.get_includes
• CAnalysis.get_includes_in_file
• CAnalysis.get_macros
• CAnalysis.get_macros_in_file
• CAnalysis.get_typedefs
• CAnalysis.get_typedefs_in_file
• CAnalysis.get_structs
• CAnalysis.get_structs_in_file
• CAnalysis.get_enums
• CAnalysis.get_enums_in_file
• CAnalysis.get_globals

[bridgetmcg]

@rahlk Can you add functionality to output the Call Graph to Json for C?