remove a lot of packages that are no longer supported

and do not work

Author: jan

io.sloeber.tests/src/io/sloeber/core/CreateAndCompileDefaultInoOnAllBoardsTest.java

@@ -58,6 +58,16 @@ public class CreateAndCompileDefaultInoOnAllBoardsTest {
             "https://redbearlab.github.io/arduino/package_redbear_index.json",
             "https://redbearlab.github.io/arduino/package_redbearlab_index.json",
             "http://drazzy.com/package_drazzy.com_index.json",
+            "http://download.labs.mediatek.com/package_mtk_linkit_smart_7688_index.json",
+            "http://download.labs.mediatek.com/package_mtk_linkit_7697_index.json",
+            "http://download.labs.mediatek.com/package_mtk_linkit_index.json",
+            "http://panstamp.org/arduino/package_panstamp_index.json",
+            "https://raw.githubusercontent.com/Seeed-Studio/Seeeduino-Boards/master/package_seeeduino_index.json",
+            "http://rig.reka.com.my/package_rig_index.json",
+            "http://adelino.cc/package_adelino_index.json",
+            "https://raw.githubusercontent.com/ioteamit/smarteverything-core/master/package_arrow_index.json",
+            "http://digistump.com/package_digistump_index.json",
+
             // confirmed 2020 03 09 version 25 12 17
             "https://raw.githubusercontent.com/avandalen/SAM15x15/master/package_avdweb_nl_index.json",