Use font ascender height for baseline offset (#139)

## Summary

* Use font ascender height for baseline offset
* Previously was using font height, but when rendering the font (even
from y = 0), there would be a lot of top margin
* Font would also go below the "bottom of the line" as we were using the
full font height as the baseline

## Additional Context

* This caused some text to move around, I've fixed everything I can
* Notably it moves the first line of font a little closer to the top of
the page

src/activities/home/HomeActivity.cpp

@@ -106,7 +106,7 @@ void HomeActivity::render() const {
   renderer.drawCenteredText(READER_FONT_ID, 10, "CrossPoint Reader", true, BOLD);
 
   // Draw selection
-  renderer.fillRect(0, 60 + selectorIndex * 30 + 2, pageWidth - 1, 30);
+  renderer.fillRect(0, 60 + selectorIndex * 30 - 2, pageWidth - 1, 30);
 
   int menuY = 60;
   int menuIndex = 0;

src/activities/reader/EpubReaderActivity.cpp

@@ -410,7 +410,7 @@ void EpubReaderActivity::renderStatusBar(const int orientedMarginRight, const in
 
   // Position status bar near the bottom of the logical screen, regardless of orientation
   const auto screenHeight = renderer.getScreenHeight();
-  const auto textY = screenHeight - orientedMarginBottom - 2;
+  const auto textY = screenHeight - orientedMarginBottom + 2;
   int percentageTextWidth = 0;
   int progressTextWidth = 0;
 

src/activities/reader/EpubReaderChapterSelectionActivity.cpp

@@ -116,7 +116,7 @@ void EpubReaderChapterSelectionActivity::renderScreen() {
   renderer.drawCenteredText(READER_FONT_ID, 10, "Select Chapter", true, BOLD);
 
   const auto pageStartIndex = selectorIndex / pageItems * pageItems;
-  renderer.fillRect(0, 60 + (selectorIndex % pageItems) * 30 + 2, pageWidth - 1, 30);
+  renderer.fillRect(0, 60 + (selectorIndex % pageItems) * 30 - 2, pageWidth - 1, 30);
   for (int i = pageStartIndex; i < epub->getSpineItemsCount() && i < pageStartIndex + pageItems; i++) {
     const int tocIndex = epub->getTocIndexForSpineIndex(i);
     if (tocIndex == -1) {

src/activities/reader/FileSelectionActivity.cpp

@@ -171,7 +171,7 @@ void FileSelectionActivity::render() const {
   }
 
   const auto pageStartIndex = selectorIndex / PAGE_ITEMS * PAGE_ITEMS;
-  renderer.fillRect(0, 60 + (selectorIndex % PAGE_ITEMS) * 30 + 2, pageWidth - 1, 30);
+  renderer.fillRect(0, 60 + (selectorIndex % PAGE_ITEMS) * 30 - 2, pageWidth - 1, 30);
   for (int i = pageStartIndex; i < files.size() && i < pageStartIndex + PAGE_ITEMS; i++) {
     auto item = files[i];
     int itemWidth = renderer.getTextWidth(UI_FONT_ID, item.c_str());