Fix last character being truncated in clipboard::copy_text due to off-by-one error (#262)

## Link to GitHub Issue, if one exists
n/a, user reported

## Description of change
When copying text to clipboard, the last character was being dropped due
to incorrect string buffer size calculation.

Also, clean up callers to just pass std:string by reference instead of
going back and forth between C-style strings.

Lastly, fix `git archive` in `build_all.sh` which broke after github
migration.

## Compiling
Yes

## Testing
Tested all three callers - IIDX cam hook, scard reader in Cards tab, and
patch manager datecode.

src/spice2x/misc/clipboard.cpp

@@ -142,14 +142,14 @@ namespace clipboard {
         handle.detach();
     }
 
-    void copy_text(const std::string str) {
+    void copy_text(const std::string& str) {
         if (!OpenClipboard(nullptr)) {
             log_warning("clipboard", "Failed to open clipboard");
             return;
         }
 
-        HGLOBAL mem = GlobalAlloc(GMEM_MOVEABLE, str.length());
-        memcpy(GlobalLock(mem), str.c_str(), str.length());
+        HGLOBAL mem = GlobalAlloc(GMEM_MOVEABLE, str.length() + 1);
+        memcpy(GlobalLock(mem), str.c_str(), str.length() + 1);
         GlobalUnlock(mem);
 
         EmptyClipboard();

src/spice2x/misc/clipboard.h

@@ -4,6 +4,6 @@
 
 namespace clipboard {
     void copy_image(const std::filesystem::path path);
-    void copy_text(const std::string str);
+    void copy_text(const std::string& str);
     const std::string paste_text();
 }