Move osmpbf-outline tool from "tools" into "demo" directory

This isn't really a useful tool for normal users. It is a demo/example
program for developers to see how the library can be used.

CMakeLists.txt

@@ -20,5 +20,5 @@ add_subdirectory(osmpbf)
 
 # The osmpbf-outline tool does not compile on Windows because getopt.h is missing
 if(NOT MSVC)
-    add_subdirectory(tools)
+    add_subdirectory(demo)
 endif()

README.md

@@ -70,11 +70,11 @@ To install:
 make install
 ```
 
-There is a tool named osmpbf-outline that shows a debug output of the contents
-of a PBF file. To run it:
+There is a demo tool named osmpbf-outline that shows a debug output of some of
+the contents of a PBF file. To run it:
 
 ```sh
-tools/osmpbf-outline osm-file.osm.pbf
+demo/osmpbf-outline osm-file.osm.pbf
 ```
 
 

demo/CMakeLists.txt

@@ -12,5 +12,5 @@ target_include_directories(osmpbf-outline SYSTEM PRIVATE ${ZLIB_INCLUDE_DIR})
 target_link_libraries(osmpbf-outline PRIVATE osmpbf ZLIB::ZLIB protobuf::libprotobuf)
 set_property(TARGET osmpbf-outline PROPERTY CXX_STANDARD 11)
 
-install(TARGETS osmpbf-outline RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR})
-install(FILES osmpbf-outline.1 DESTINATION ${CMAKE_INSTALL_MANDIR}/man1)
+#install(TARGETS osmpbf-outline RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR})
+#install(FILES osmpbf-outline.1 DESTINATION ${CMAKE_INSTALL_MANDIR}/man1)