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allow comments in spit presentations

	all lines starting with a semicolon are comments and thus discarded

--- a/sample.spit

+++ b/sample.spit

@@ -1,3 +1,4 @@

+; Demonstration of spit capabilities

 # A sample presentation

 spit is a simple presentation tool for plan9.

 spit presentations are simple markdown-like files.

@@ -7,11 +8,12 @@

 - Quote if the line starts with '> '

 - Code if the line is ``` (code block is ended with a similar line).

 - Image, in p9 format, if the line starts with '! '

+Lines starting with a semicolon are comments and ignored by spit.

 spit doesn't try to do proper layout or resizing, it's on you.

-# Some style examples

-Here is a simple hello world in plan9 C

+# Some examples

+Here is a simple hello world in plan9 C:

 ```

 #include <u.h>

 #include <libc.h>

--- a/spit.c

+++ b/spit.c

@@ -191,7 +191,7 @@

 void

 render(char *f)

 {

-	enum { Sstart, Scontent, Slist, Squote, Scode };

+	enum { Sstart, Scomment, Scontent, Slist, Squote, Scode };

 	Biobuf *bp;

 	char *l;

 	int s, ln;

@@ -214,6 +214,10 @@

 Again:

 		switch(s){

 		case Sstart:

+			if(l[0] == ';'){

+				free(l);

+				continue;

+			}

 			if(l[0] != '#') error(f, ln, "expected title line");

 Title:

 			p = Pt(margin, margin);

@@ -221,6 +225,9 @@

 			p = rendertitle(b, p, l+2);

 			s = Scontent;

 			break;

+		case Scomment:

+			s = Scontent;

+			break;

 		case Scontent:

 			if(l[0] == '#')

 				goto Title;

@@ -235,7 +242,10 @@

 				break;

 			}else if(l[0] == '!')

 				p = renderimage(b, p, l+2);

-			else

+			else if(l[0] == ';'){

+				s = Scomment;

+				break;

+			}else

 				p = rendertext(b, p, l);

 			break;

 		case Slist:

@@ -392,6 +402,7 @@

 		fprint(2, "missing filename\n");

 		usage();

 	}

+	setfcr(getfcr() & ~(FPZDIV | FPOVFL | FPINVAL));

 	if(initdraw(nil, nil, argv0) < 0)

 		sysfatal("initdraw: %r");

 	if((mc = initmouse(nil, screen)) == nil)