Merge branch 'develop' of JF/PineTime into master

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diff --git a/src/libs/lvgl b/src/libs/lvgl
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+Subproject b89c30eafe1397a778ae5d65f108a0ef820de12
diff --git a/src/libs/lvgl/docs/CODING_STYLE.md b/src/libs/lvgl/docs/CODING_STYLE.md
deleted file mode 100644
index 31071e9..0000000
--- a/src/libs/lvgl/docs/CODING_STYLE.md
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-
-## File format
-Use [lv_misc/lv_templ.c](https://github.com/littlevgl/lvgl/blob/master/src/lv_misc/lv_templ.c) and [lv_misc/lv_templ.h](https://github.com/littlevgl/lvgl/blob/master/src/lv_misc/lv_templ.h)
-
-## Naming conventions
-* Words are separated by '_'
-* In variable and function names use only lower case letters (e.g. *height_tmp*)
-* In enums and defines use only upper case letters (e.g. *e.g. MAX_LINE_NUM*)
-* Global names (API):
-  * starts with *lv*
-  * followed by module name: *btn*, *label*, *style* etc.
-  * followed by the action (for functions): *set*, *get*, *refr* etc.
-  * closed with the subject: *name*, *size*, *state* etc. 
-* Typedefs
-  * prefer `typedef struct` and `typedef enum` instead of  `struct name` and `enum name`
-  * always end `typedef struct` and `typedef enum` type names with `_t`
-* Abbreviations:
-  * Use abbreviations on public names only if they become longer than 32 characters 
-  * Use only very straightforward (e.g. pos: position) or well-established (e.g. pr: press) abbreviations 
-
-## Coding guide
-* Functions:
-  * Try to write function shorter than is 50 lines 
-  * Always shorter than 100 lines (except very straightforwards) 
-* Variables:
-  * One line, one declaration (BAD: char x, y;)
-  * Use `<stdint.h>` (*uint8_t*, *int32_t* etc)
-  * Declare variables when needed (not all at function start)
-  * Use the smallest required scope
-  * Variables in a file (outside functions) are always *static*
-  * Do not use global variables (use functions to set/get static variables)
-
-## Comments
-Before every function have a comment like this:
-
-```c
-/**
- * Return with the screen of an object
- * @param obj pointer to an object
- * @return pointer to a screen
- */
-lv_obj_t * lv_obj_get_scr(lv_obj_t * obj); 
-```
-
-Always use `/* Something */` format and NOT `//Something`
-
-Write readable code to avoid descriptive comments like: 
-`x++; /* Add 1 to x */`. 
-The code should show clearly what you are doing.
-
-You should write **why** have you done this: 
-`x++; /*Because of closing '\0' of the string */`
-
-Short "code summaries" of a few lines are accepted. E.g. `/*Calculate the new coordinates*/`
-
-In comments use \` \` when referring to a variable. E.g. ``/*Update the value of `x_act`*/``
-
-### Formatting
-Here is example to show bracket placing and using of white spaces:
-```c
-/**
- * Set a new text for a label. Memory will be allocated to store the text by the label.
- * @param label pointer to a label object
- * @param text '\0' terminated character string. NULL to refresh with the current text.
- */
-void lv_label_set_text(lv_obj_t * label, const char * text)
-{   /* Main brackets of functions in new line*/
-    
-    if(label == NULL) return; /*No bracket only if the command is inline with the if statement*/
-    
-    lv_obj_inv(label);
-    
-    lv_label_ext_t * ext = lv_obj_get_ext(label);
-
-    /*Comment before a section */
-    if(text == ext->txt || text == NULL) {  /*Bracket of statements start inline*/
-        lv_label_refr_text(label);
-        return;   
-    }
-    
-    ...
-}
-```
-
-Use 4 spaces indentation instead of tab.
-
-You can use **astyle** to format the code. The required config flies are: `docs/astyle_c` and `docs/astyle_h`.
-To format the source files: 
- `$ find . -type f -name "*.c" | xargs astyle --options=docs/astyle_c`
- 
-To format the header files:
- `$ find . -type f -name "*.h" | xargs astyle --options=docs/astyle_h`
- 
-Append `-n` to the end to skip creation of backup file OR use `$ find . -type f -name "*.bak"  -delete` (for source file's backups) and `find . -type f -name "*.orig" -delete` (for header file's backups)