make platformio.ini even more modular

arch/rp2040/rp2040.ini

@@ -0,0 +1,19 @@
+; Common settings for rp2040 Processor based targets
+[rp2040_base]
+platform = https://github.com/maxgerhardt/platform-raspberrypi.git
+extends = arduino_base
+board_build.core = earlephilhower
+board_build.filesystem_size = 0.5m
+build_flags = 
+  ${arduino_base.build_flags} -Wno-unused-variable 
+  -Isrc/platform/rp2040
+  -D__PLAT_RP2040__
+#  -D _POSIX_THREADS
+build_src_filter = 
+  ${arduino_base.build_src_filter} -<platform/esp32/> -<nimble/> -<mesh/wifi/> -<mesh/http/> -<modules/esp32> -<mqtt/> -<platform/nrf52/> -<platform/stm32wl>
+lib_ignore =
+  BluetoothOTA
+lib_deps =
+  ${arduino_base.lib_deps}
+  ${environmental_base.lib_deps}
+  https://github.com/kokke/tiny-AES-c.git