Add make format to format code.

A consistent style should help with contributors and
readability. We use astyle as the formatter as can make a pretty
good approximation of the current style and my preferred style.

Astyle can be found at http://astyle.sourceforge.net/astyle.html

tools/symcharsgen.c

@@ -29,23 +29,23 @@ static int is_symbol_char_gen(uint8_t c) {
     if (c >= 'A' && c <= 'Z') return 1;
     if (c >= '0' && c <= '9') return 1;
     return (c == '!' ||
-        c == '$' ||
-        c == '%' ||
-        c == '&' ||
-        c == '*' ||
-        c == '+' ||
-        c == '-' ||
-        c == '.' ||
-        c == '/' ||
-        c == ':' ||
-        c == '<' ||
-        c == '?' ||
-        c == '=' ||
-        c == '>' ||
-        c == '@' ||
-        c == '^' ||
-        c == '_' ||
-        c == '|');
+            c == '$' ||
+            c == '%' ||
+            c == '&' ||
+            c == '*' ||
+            c == '+' ||
+            c == '-' ||
+            c == '.' ||
+            c == '/' ||
+            c == ':' ||
+            c == '<' ||
+            c == '?' ||
+            c == '=' ||
+            c == '>' ||
+            c == '@' ||
+            c == '^' ||
+            c == '_' ||
+            c == '|');
 }
 
 int main() {