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

.circleci/config.yml

@@ -127,26 +127,26 @@ jobs:
     machine: True
     steps:
       - checkout
-      # - run: docker pull deltachat/doxygen 
+      # - run: docker pull deltachat/doxygen
       - run: docker pull deltachat/coredeps
-      - run: 
-          name: build docs, run tests and build wheels 
+      - run:
+          name: build docs, run tests and build wheels
           command: ci_scripts/ci_run.sh
           environment:
             TESTS: 1
             DOCS: 1
 
-      - run: 
-           name: copying docs and wheels to workspace 
+      - run:
+           name: copying docs and wheels to workspace
            command: |
              mkdir -p workspace/python
              # cp -av docs workspace/c-docs
              cp -av python/.docker-tox/wheelhouse workspace/
              cp -av python/doc/_build/ workspace/py-docs
 
-      - persist_to_workspace: 
-          root: workspace 
-          paths: 
+      - persist_to_workspace:
+          root: workspace
+          paths:
             # - c-docs
             - py-docs
             - wheelhouse
@@ -157,7 +157,7 @@ jobs:
       - checkout
       - attach_workspace:
           at: workspace
-      - run: ls -laR workspace 
+      - run: ls -laR workspace
       - run: ci_scripts/ci_upload.sh workspace/py-docs workspace/wheelhouse
 
 
@@ -175,12 +175,17 @@ workflows:
           requires:
             - cargo_fetch
 
-      # Linux Desktop
+      # Linux Desktop 64bit
       - test_x86_64-unknown-linux-gnu:
           requires:
             - cargo_fetch
 
-      # Linux Desktop
+      # Linux Desktop 32bit
+      # - test_i686-unknown-linux-gnu:
+      #     requires:
+      #       - cargo_fetch
+
+      # Android 64bit
       # - test_aarch64-linux-android:
       #     requires:
       #       - cargo_fetch