Miscellaneous improvements

Improve modularity of CMake design
Improve building speed in multicore processors
Files command_event.* moved to core/libs
Remove Armadillo from public core_receiver interface
Uniformize name format for classes
Apply some fixes by clang-tidy
Improve documentation

src/algorithms/signal_source/gnuradio_blocks/CMakeLists.txt

@@ -60,15 +60,20 @@ add_library(signal_source_gr_blocks
 
 target_link_libraries(signal_source_gr_blocks
     PUBLIC
+        signal_source_libs
         Boost::thread
         Gnuradio::runtime
-        signal_source_libs
     PRIVATE
-        core_receiver
+        core_libs
         Gflags::gflags
         Glog::glog
 )
 
+target_include_directories(signal_source_gr_blocks
+    PUBLIC
+        ${CMAKE_SOURCE_DIR}/src/core/receiver
+)
+
 if(ENABLE_RAW_UDP AND PCAP_FOUND)
     target_link_libraries(signal_source_gr_blocks
         PUBLIC

src/algorithms/signal_source/libs/CMakeLists.txt

@@ -71,10 +71,15 @@ target_link_libraries(signal_source_libs
     PUBLIC
         Boost::boost
         Gnuradio::runtime
-        core_receiver
     PRIVATE
         Gflags::gflags
         Glog::glog
+        core_libs
+)
+
+target_include_directories(signal_source_libs
+    PUBLIC
+        ${CMAKE_SOURCE_DIR}/src/core/receiver
 )
 
 if(ENABLE_PLUTOSDR OR ENABLE_FMCOMMS2)