Add .editorconfig and CI check for trailing whitespace

.editorconfig

@@ -0,0 +1,3 @@
+[*]
+trim_trailing_whitespace = false
+insert_final_newline = false

.github/workflows/check-whitespace.yml

@@ -0,0 +1,16 @@
+# Credit: https://github.com/zlib-ng/zlib-ng/blob/develop/.github/workflows/lint.yml
+name: Check trailing whitespace
+on: [pull_request]
+
+jobs:
+  lint:
+    name: Check trailing whitespace
+    runs-on: ubuntu-latest
+    steps:
+    - name: Checkout repository
+      uses: actions/checkout@v4
+
+    - name: Whitespace errors
+      run: |
+        git config core.whitespace blank-at-eol
+        git diff --color --check ${{ github.event.pull_request.base.sha }} -- './src' ':!./src/lib' ':!./src/webSDK'

src/base/UFont.pas

@@ -768,7 +768,7 @@   TBitmapFont = class(TFont)
       fAscender:  integer;
       fDescender: integer;
       fWidths:    array[0..255] of byte; //**< half widths
-      fOutline:   integer;
+      fOutline:   integer; 
       fTempColor: TGLColor; //**< colours for the reflection
 
       procedure ResetIntern();