feat: add inline and block runner. Improve execution error handling

examples/reports_2011-01.md

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+# Finance Report from 2011-01 to 2011-02
+
+## Previous status:
+
+
+```
+Balance Sheet 2010-12-31
+
+                                || 2010-12-31 
+================================++============
+ Assets                         ||            
+--------------------------------++------------
+ Assets:Checking                ||   $-225.00 
+--------------------------------++------------
+                                ||   $-225.00 
+================================++============
+ Liabilities                    ||            
+--------------------------------++------------
+ Liabilities:Mortgage:Principal ||   $-200.00 
+--------------------------------++------------
+                                ||   $-200.00 
+================================++============
+ Net:                           ||    $-25.00 
+
+```
+
+
+## Expenses:
+
+### Expense Summary by Category
+
+
+```
+Budget performance in 2011-01:
+
+               ||                          Jan 
+===============++==============================
+ Expenses      || $5,629.00                    
+ Expenses:Food ||   $109.00 [ 109% of $100.00] 
+---------------++------------------------------
+               || $5,629.00 [5629% of $100.00] 
+
+```
+
+
+
+```
+           $5,500.00  Expenses:Auto
+             $109.00  Expenses:Food
+              $20.00  Expenses:Books
+--------------------
+           $5,629.00  
+
+```
+
+
+## Net Income:
+
+
+```
+Income Statement 2011-01
+
+                         ||        Jan 
+=========================++============
+ Revenues                ||            
+-------------------------++------------
+ Income:Salary           ||  $2,000.00 
+-------------------------++------------
+                         ||  $2,000.00 
+=========================++============
+ Expenses                ||            
+-------------------------++------------
+ Expenses:Auto           ||  $5,500.00 
+ Expenses:Books          ||     $20.00 
+ Expenses:Food:Groceries ||    $109.00 
+-------------------------++------------
+                         ||  $5,629.00 
+=========================++============
+ Net:                    || $-3,629.00 
+
+```
+
+
+## Ending balance:
+
+
+```
+Balance Sheet 2011-01-31
+
+                                || 2011-01-31 
+================================++============
+ Assets                         ||            
+--------------------------------++------------
+ Assets:Checking                ||  $1,366.00 
+ Assets:Savings                 || $-5,200.00 
+--------------------------------++------------
+                                || $-3,834.00 
+================================++============
+ Liabilities                    ||            
+--------------------------------++------------
+ Liabilities:MasterCard         ||     $20.00 
+ Liabilities:Mortgage:Principal ||   $-200.00 
+--------------------------------++------------
+                                ||   $-180.00 
+================================++============
+ Net:                           || $-3,654.00 
+
+```
+