Add separate header-files for each page/view

Yet another step towards removing cgit.h.

Signed-off-by: Lars Hjemli <hjemli@gmail.com>

ui-blob.h

@@ -0,0 +1,6 @@
+#ifndef UI_BLOB_H
+#define UI_BLOB_H
+
+extern void cgit_print_blob(const char *hex, char *path);
+
+#endif /* UI_BLOB_H */