add autocomplete feature for note linking (Closes pbek/QOwnNotes#2903)

autocomplete-note-names/autocomplete-note-names.qml

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+import QtQml 2.0 
+import QOwnNotesTypes 1.0
+
+Script {
+    function autocompletionHook() {
+        // get the current word plus non-word-characters before the word to also get the "[<"-character
+        var word = script.noteTextEditCurrentWord(true);
+
+        var noteSubFolderQmlObj = Qt.createQmlObject("import QOwnNotesTypes 1.0; NoteSubFolder{}", mainWindow, "noteSubFolder");
+        var noteSubFolder = noteSubFolderQmlObj.activeNoteSubFolder();
+
+        if (!word.startsWith("[<") || !noteSubFolder || !noteSubFolder.notes) {
+            return [];
+        }
+        // cut the "[>]" off of the string and do a substring search for notes
+        var searchString = word.slice(2,-1).trim();
+
+        // array holds the matching names
+        var matchedNotes = [];
+
+        for(var i in noteSubFolder.notes){
+            var note = noteSubFolder.notes[i];
+            if(note.name.toLowerCase().startsWith(searchString.toLowerCase())){
+                matchedNotes.push(note.name);
+            }
+        }
+        return matchedNotes;
+    }
+
+}

autocomplete-note-names/info.json

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+{
+  "name": "Autocomplete Note Names",
+  "identifier": "autocomplete-note-names",
+  "script": "autocomplete-note-names.qml",
+  "authors": ["@pi55man"],
+  "platforms": ["linux", "macos", "windows"],
+  "version": "1.0.0",
+  "minAppVersion": "17.06.2",
+  "description" : "This script provides autocompletion for note names in QOwnNotes."
+}