Lua inputbox: Allow negative values and floating point input. Unfinished, has problems of display (mouse cursor cleaning, display cleaning and alignment, removing redundant digits like in 15.000)

git-svn-id: svn://pulkomandy.tk/GrafX2/trunk@1354 416bcca6-2ee7-4201-b75f-2eb2f807beb1

misc.h

@@ -150,9 +150,16 @@ unsigned long Memory_free(void);
 
 #define Num2str(a,b,c) sprintf(b,"%*lu",c,(long)(a))
 
+#define Dec2str(a,b,c) sprintf(b,"%.*f",c,(double)(a))
+
 short Round(float value);
 short Round_div_max(short numerator,short divisor);
 
+/* round number n to d decimal points */
+double Fround(double n, unsigned d);
+
+
+
 int Min(int a,int b);
 int Max(int a,int b);