Please add more ways to remove header formatting when exporting to Excel
#### Code Sample, a copy-pastable example if possible

```python
pandas.io.formats.excel.header_style = None
pandas.core.format.header_style = None
pandas.formats.format.header_style = None

```
#### Problem description

Every time I try to make a simple xlsx file out of a bunch of SQL results I end up spending most of my time trying to get rid of the awful default header format. I never remember how to do it so I try all the ways that are on the internet and usually none of them work.

Can you please add at least 4 different ways to disable the default formatting so I can spend more time trying to figure such a trivial action next time ?

Also it would be great if the default header font can be changed to Comic Sans with Yellow font color, I can then go and fix the header formatting manually for every file because nobody will be able to read it.

Best case scenario would be to somehow randomize this property that disables formatting so it changes from version to version and old ways to turn it off come and go so I can avoid more work by monkey patching the package every time I update.

Thank you !

#### Expected Output
pandas.io.formats.excel.header_style = None
pandas.core.format.header_style = None
pandas.formats.format.header_style = None
pandas.formats.io.excel.header = None
pandas.excel.formats.io.header = None
pandas.pandas.pandas.header = None
pandas.defaults.excel.headers.style = None
pandas.formats.excel.header.interior.color = None
pandas.formats.excel.header.borders.color = None
pandas.formats.excel.header.borders.style = None

#### Output of ``pd.show_versions()``

<details>

INSTALLED VERSIONS         
------------------         
commit: None               
python: 3.5.3.final.0      
python-bits: 64            
OS: Linux                  
OS-release: 4.9.0-8-amd64  
machine: x86_64            
processor:                 
byteorder: little          
LC_ALL: None               
LANG: en_GB.UTF-8          
LOCALE: en_GB.UTF-8        
                           
pandas: 0.24.1             
pytest: None               
pip: 19.0.2                
setuptools: 40.6.3         
Cython: None               
numpy: 1.16.1              
scipy: None                
pyarrow: None              
xarray: None               
IPython: None              
sphinx: None               
patsy: None                
dateutil: 2.8.0            
pytz: 2018.9               
blosc: None                
bottleneck: None           
tables: None               
numexpr: None              
feather: None              
matplotlib: None           
openpyxl: None             
xlrd: None                 
xlwt: None                 
xlsxwriter: 1.1.4          
lxml.etree: 4.3.1          
bs4: None                  
html5lib: None             
sqlalchemy: None           
pymysql: None              
psycopg2: None             
jinja2: None               
s3fs: None                 
fastparquet: None          
pandas_gbq: None           
pandas_datareader: None    
gcsfs: None                

</details>
