move to stock esp_http_server but keep it under control

- means 3 sockets are used (data + 2 for control)
- but LRU is activated (uses the 2 extra sockets to wake from select)
- backlog is just 1 (listen)
- only 3 sockets can be consumed before LRU activates
- for now, connections are kept-alive

components/esp_http_server/CMakeLists.txt

@@ -0,0 +1,10 @@
+idf_build_get_property(prefix IDF_PATH)
+string(CONCAT prefix "${prefix}" "/components/esp_http_server")
+
+idf_component_register(
+		SRC_DIRS "${prefix}/src"	"${prefix}/src/util"	
+		INCLUDE_DIRS "${prefix}/include"
+                PRIV_INCLUDE_DIRS "." "${prefix}/src/port/esp32" "${prefix}/src/util"
+                REQUIRES nghttp # for http_parser.h
+                PRIV_REQUIRES lwip
+)