Tools path unversioned properties are adjusted right before compiling.

This way, when multiple versions of, e.g., bossac are installed and
a platform uses bossac 1.5, core author will be able to specify just
tools.bossac.path={runtime.tools.bossac.path}
and the IDE will set it to right version of bossac
Fixes #3325

arduino-core/src/processing/app/BaseNoGui.java

@@ -21,7 +21,6 @@
 import processing.app.packages.UserLibrary;
 
 import java.io.*;
-import java.net.URISyntaxException;
 import java.util.*;
 import java.util.logging.Level;
 import java.util.logging.Logger;
@@ -635,7 +634,7 @@ static public void initPackages() throws Exception {
     loadHardware(getHardwareFolder());
     loadContributedHardware(indexer);
     loadHardware(getSketchbookHardwareFolder());
-    createToolPreferences(indexer);
+    createToolPreferences(indexer.getInstalledTools(), true);
 
     librariesIndexer = new LibrariesIndexer(BaseNoGui.getSettingsFolder(), indexer);
     File librariesIndexFile = librariesIndexer.getIndexFile();
@@ -826,12 +825,13 @@ static protected void loadContributedHardware(ContributionsIndexer indexer) {
     }
   }
 
-  static private void createToolPreferences(ContributionsIndexer indexer) {
-    // Remove previous runtime preferences
-    final String prefix = "runtime.tools.";
-    PreferencesData.removeAllKeysWithPrefix(prefix);
+  public static void createToolPreferences(Collection<ContributedTool> installedTools, boolean removeOldKeys) {
+    String prefix = "runtime.tools.";
+    if (removeOldKeys) {
+      PreferencesData.removeAllKeysWithPrefix(prefix);
+    }
 
-    for (ContributedTool tool : indexer.getInstalledTools()) {
+    for (ContributedTool tool : installedTools) {
       File installedFolder = tool.getDownloadableContribution(getPlatform()).getInstalledFolder();
       if (installedFolder != null) {
         PreferencesData.set(prefix + tool.getName() + ".path", installedFolder.getAbsolutePath());

arduino-core/src/processing/app/debug/Compiler.java

@@ -34,6 +34,8 @@
 import java.util.stream.Stream;
 
 import cc.arduino.MyStreamPumper;
+import cc.arduino.contributions.packages.ContributedPlatform;
+import cc.arduino.contributions.packages.ContributedTool;
 import cc.arduino.packages.BoardPort;
 import cc.arduino.packages.Uploader;
 import cc.arduino.packages.UploaderFactory;
@@ -613,7 +615,13 @@ private PreferencesMap createBuildPreferences(String _buildPath,
     } else {
       p.put("build.variant.path", "");
     }
-
+
+    ContributedPlatform installedPlatform = BaseNoGui.indexer.getInstalled(referencePlatform.getContainerPackage().getId(), referencePlatform.getId());
+    if (installedPlatform != null) {
+      List<ContributedTool> tools = installedPlatform.getResolvedTools();
+      BaseNoGui.createToolPreferences(tools, false);
+    }
+
     // Build Time
     Date d = new Date();
     GregorianCalendar cal = new GregorianCalendar();