The big sqlite refactor

* refactor: safe sql access

* Clean up the worst rebase mistakes

* Some more progress on the rebase fallout and this branch

* upgrade and compile again

* cleanup from rebase

* example of how to prepare now

* rebase fixes

* add sql.query_map

* less preparation

* more improvements in sql code

* fix string truncation

* more prepare conversions

* most prep done

* fix tests

* fix ffi

* fix last prepares

* fix segfaults and some queries

* use r2d2 pool

* fix dc_job sql call, to reduce contention

* try newer rust

* No more vararg printing (drop dc_log_)

* ignore expected errors

* fix: uses exists instead of execute where needed

* fix: get_contacts logic was broken

* fix: contact creation

* test on 32bit linux

* ci: try running 32bit without cross

* undo 32bit tests

* refactor: rename dc_sqlite3 to sql

* fix: safer string conversions

* more string fixes

* try fixing appveyor build to 64bit

* chore(ci): hardcode target

* chore(ci): appveyor

* some cleanup work

* try fix darwin

* fix and improve sql escaping

* fix various bugs

* fix chat deletion

* refactor: cleanup config values and move to their own file

* refactor: move more methods onto the sql struct

* dont panic on failed state loading

* first round of cr

* one more cr fix

* stop using strange defaults

* remove unused escapes

src/x.rs

@@ -45,12 +45,6 @@ extern "C" {
             unsafe extern "C" fn(_: *const libc::c_void, _: *const libc::c_void) -> libc::c_int,
         >,
     );
-    pub fn vsnprintf(
-        _: *mut libc::c_char,
-        _: libc::c_ulong,
-        _: *const libc::c_char,
-        _: ::std::ffi::VaList,
-    ) -> libc::c_int;
 
     // -- DC Methods
     pub fn dc_mprintf(format: *const libc::c_char, _: ...) -> *mut libc::c_char;