Fix a FontSize Slider problem; introduce a font test

1. Fix a problem with font size on sliders
2. Introduce a test font, credited in the README-IndieFlower.txt,
   and have a compile time flag to swap to it to make sure we are
   using font api consistently

CMakeLists.txt

@@ -837,6 +837,7 @@ if( BUILD_SURGE_XT )
   file(GLOB SURGE_SYNTH_JUCE_RESOURCES_GLOB
           assets/SurgeClassic/exported/*svg
           resources/fonts/Lato*ttf
+          resources/fonts/IndieFlower.ttf
           )
 
   juce_add_binary_data( surge-xt-binary

resources/fonts/README-IndieFlower.txt

@@ -0,0 +1,2 @@
+IndieFlower is an OFL font from https://fontlibrary.org/en/font/indie-flower
+authored by Kimberly Geswein. We use it here for testing purposes.

src/common/gui/CSurgeSlider.cpp

@@ -153,7 +153,8 @@ void CSurgeSlider::draw(CDrawContext *dc)
     }
 
     labfont.setStyleFlags(font_style);
-    labfont.setHeight(font_size);
+    if (font_size != labfont.getHeightInPoints())
+        labfont = labfont.withPointHeight(font_size);
 
     CRect size = getViewSize();
 

src/common/gui/RuntimeFont.cpp

@@ -26,8 +26,14 @@ namespace GUI
 
 DefaultFonts::DefaultFonts()
 {
+#define TEST_WITH_INDIE_FLOWER 0
+#if TEST_WITH_INDIE_FLOWER
+    latoRegularTypeface = juce::Typeface::createSystemTypefaceFor(BinaryData::IndieFlower_ttf,
+                                                                  BinaryData::IndieFlower_ttfSize);
+#else
     latoRegularTypeface = juce::Typeface::createSystemTypefaceFor(BinaryData::LatoRegular_ttf,
                                                                   BinaryData::LatoRegular_ttfSize);
+#endif
 
     displayFont = getLatoAtSize(9);
     patchNameFont = getLatoAtSize(13);